/*
 * Copyright 2022 The Open Islands Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.openislands.oi.rpc.http;

import org.openislands.oi.rpc.base.Executor;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.web.client.ResponseExtractor;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

public class ResponseCallbackChain implements ResponseExtractor<Object> {
    private final Executor<?> executor;
    private final List<HttpResponseListener> httpResponseListenerLinkedList;

    public ResponseCallbackChain(Executor<?> executor) {
        this.executor = executor;
        this.httpResponseListenerLinkedList = new ArrayList<>();
    }

    public void add(HttpResponseListener httpResponseListener) {
        this.httpResponseListenerLinkedList.add(httpResponseListener);
    }

    public void addAll(List<HttpResponseListener> httpResponseListenerList) {
        for (HttpResponseListener httpResponseListener : httpResponseListenerList) {
            this.add(httpResponseListener);
        }
    }

    @Override
    public Object extractData(ClientHttpResponse response) throws IOException {
        for (HttpResponseListener httpResponseListener : this.httpResponseListenerLinkedList) {
            Object result = httpResponseListener.onEvent(executor, response);
            if (Objects.nonNull(result)) return result;
        }
        return null;
    }
}